00:01
To find the surface area of a prism, you've got pairs of size that we need to find the areas of.
00:10
They add it all together.
00:12
So, for instance, we've got the front and back, which are both going to be 10 by 5, 10 by 5 rectangles.
00:22
So i'm going to write it like 2 times 10 by 5 plus 2 times, let's go left and right.
00:30
That's going to be 15 by 5 left and right.
00:35
And then top and bottom, that's 10 by 15.
00:42
Okay, so that would be 2 times 50 plus 2 times 15 times 5 is 75, and 10 times 15 is 150.
00:59
2 times 50 plus 2 times 75 plus 2 times 150 is 550 square centimeters...